Ti4O7/CoNi/CNT异质结构的界面调控及吸波机制研究OA

In light of increasingly complex electromagnetic(EM)environments and growing multi-spectrum detection threats,the development of high-performance stealth materials has become critically urgent.Although oxygen-deficient Ti4O7 exhibits relatively high electrical conductivity and EM attenuation capability,its excessively high dielectric constant often leads to impedance mismatch,thereby limiting its practical applicability.To address this challenge,Ti4O7 can be integrated with magnetic or dielectric materials possessing complementary EM properties,enabling enhanced ferromagnetic resonance and dielectric loss performance.In this study,the electronic structure and crystal defects of TiO2 were initially modulated via a hydrogen reduction method,successfully yielding phase-pure Ti4O7.Subsequently,a magnetic CoNi alloy and carbon nanotube(CNT)were deposited onto its surface through a solvothermal process,forming a Ti4O7/CoNi/CNT composite absorber.Within this architecture,the CoNi layer contributes to enhanced interfacial polarization and magnetic loss,while the incorporation of CNT effectively increases conductive loss and reduces overall material density,thus achieving a synergistic improvement in both dielectric and magnetic loss mechanisms.Experimental results demonstrate that when the Ti4O7/CoNi/CNT composite with a CNT mass fraction of 4%is incorporated into a paraffin matrix at a loading content of 45%(in mass)and a thickness of 2.03 mm,the minimum reflection loss reaches-80.6 dB,with an effective absorption bandwidth of 2.0 GHz.In conclusion,the Ti4O7/CoNi/CNT composite exhibits exceptional EM wave absorption performance,offering significant implications for the stealth protection of advanced platforms such as unmanned aerial vehicles.